Thanks rokgpsman! That helps a lot. Now I know what to look for (although it seems eBay and the like are nearly devoid of many of these parts and accessories which surprises me.)
Sometimes the parts are a little harder to come by on places like ebay, but often you can find someone here that has what you are looking for, or knows someone that does. A lot of the slot machine dealers and other persons have machines they are parting out, so they sometimes have a compatible machine that can provide the part you need.
Everyone here is allowed to post a Want To Buy (WTB) ad for free in any forum and then one of the NLG staff folks will move it over to the Classified Ads area. (normally to post something in the Classified Ads area you have to be a contributing member, but an exception is made for WTB ads, anyone can have a WTB listed).
There are many slot machine vendors that check in here less often than the hobbyists and they sometimes just look at the Classified Ads forum. So don't hesitate to post a WTB when you are looking for something.